Test 2: Left Front Door Switch
WARNING: This page is about a different car, the 2000 Mercedes-Benz SLK230 and 1999 Mercedes-Benz SLK230. However, it is still accessible from the selected car via links, so may be relevant.
Connect breakout box to Pneumatic System Equipment (PSE) control module. Measure voltage between breakout box terminal No. 60 and PSE control module connector No. 2 terminal No. 4. Close left door. Voltage should be less than one volt with door closed. Open door. Battery voltage should exist with door open. If voltage is as specified, test is complete. If voltage is not as specified, check wiring. See WIRING DIAGRAMS . If wiring is okay, replace left front door switch.